Reference: (\Linear Technology Corporation\EMCS81657A-EURO)

Transcription

1 MET Laboratories, Inc. Safety Certification - EMI - Telecom Environmental Simulation 914 WEST PATAPSCO AVENUE BALTIMORE, MARYLAND PHONE (410) FAX (410) WESTERN AVENUE UNION CITY, CALIFORNIA PHONE (510) FAX (510) BELICK STREET SANTA CLARA, CA PHONE (408) FAX (510) August 07, 2009 Linear Technology Corporation 1630 McCarthy Blvd. Milpitas, CA Dear David Ng, Enclosed is the EMC test report for compliance testing of the Linear Technology Corporation, LTM8020 (200mA, 36V DC/DC μmodule), tested to the requirements of EN 55022: 2006 for a Class B Device. Thank you for using the services of MET Laboratories, Inc. If you have any questions regarding these results or if MET can be of further service to you, please feel free to contact me. Sincerely yours, MET LABORATORIES, INC. Kanesa Pogi Documentation Department Reference: (\Linear Technology Corporation\EMCS81657A-EURO) Certificates and reports shall not be reproduced except in full, without the written permission of MET Laboratories, Inc. This letter of transmittal is not a part of the attached report. The Nation s First Licensed Nationally Recognized Testing Laboratory

2 MET Laboratories, Inc. Safety Certification - EMI - Telecom Environmental Simulation 914 WEST PATAPSCO AVENUE BALTIMORE, MARYLAND PHONE (410) FAX (410) WESTERN AVENUE UNION CITY, CALIFORNIA PHONE (510) FAX (510) BELICK STREET SANTA CLARA, CA PHONE (408) FAX (510) Electromagnetic Compatibility Test Report for the Linear Technology Corporation Tested under EN 55022: 2006 For a Class B Device MET Report: EMCS81657A-EURO August 07, 2009 Prepared for: Linear Technology Corporation 1630 McCarthy Blvd. Milpitas, CA Prepared by: MET Laboratories, Inc Western Avenue Union City, California Certificates and reports shall not be reproduced except in full, without the written permission of MET Laboratories, Inc.

3 Electromagnetic Compatibility Test Report For the Linear Technology Corporation Tested under EN 55022: 2006 For a Class B Device MET Report: EMCS81657A-EURO Asad Bajwa, Manager Electromagnetic Compatibility Lab Kanesa Pogi Documentation Department Engineering Statement: The measurements shown in this report were made in accordance with the procedures indicated, and the emissions from this equipment were found to be within the applicable limits. I assume full responsibility for the accuracy and completeness of these measurements, and for the qualifications of all persons taking them. It is further stated that upon the basis of the measurements made, the equipment tested is capable of operation in accordance with the requirements of EN 55022: 2006 under normal use and maintenance. Randy Hoopai Electromagnetic Compatibility Lab MET Report: EMCS81657A-EURO 2009, MET Laboratories, Inc. Page ii of v

4 Report Status Sheet Revision Report Date Reason for Revision Ø August 07, 2009 Initial Issue. MET Report: EMCS81657A-EURO 2009, MET Laboratories, Inc. Page iii of v

5 Table of Contents 1.0 Testing Summary Equipment Configuration Overview Test Site Description of Test Sample Equipment Configuration Support Equipment Ports and Cabling Information Mode of Operation Method of Monitoring EUT Operation Modifications Disposition of EUT Electromagnetic Compatibility Emission Criteria Radiated Emission: Limits of Electromagnetic Radiation Disturbance Test Equipment...11 List of Tables Table 1. Executive Summary of EN Compliance Testing...1 Table 2. Equipment Configuration...3 Table 3. Support Equipment...3 Table 4. Ports and Cabling Information...4 Table 5. Electromagnetic Radiated Disturbance limits from Clause 6 of EN Table 6. Radiated Emission Test Results, Mode 1 36Vin, 1.25Vout, 200mA...7 Table 7. Radiated Emission Test Results, Mode 2 36Vin, 2.5Vout, 200mA...8 Table 8. Radiated Emission Test Results, Mode 3 36Vin, 5Vout, 200mA...9 List of Figures Figure 1. Block Diagram of Test Configuration...3 List of Photographs Photograph 1. Radiated Emission: Limits of Electromagnetic Radiation Disturbance, Test Setup...10 MET Report: EMCS81657A-EURO 2009, MET Laboratories, Inc. Page iv of v

6 AC ACF Cal d db dbµa dbµv dbµa/m dbµv/m DC E ESD EUT f CISPR GRP H HCP Hz IEC khz kpa kv LISN MHz List of Terms and Abbreviations Alternating Current Antenna Correction Factor Calibration Measurement Distance Decibels Decibels above one microamp Decibels above one microvolt Decibels above one microamp per meter Decibels above one microvolt per meter Direct Current Electric Field Electrostatic Discharge Equipment Under Test Frequency Comite International Special des Perturbations Radioelectriques (International Special Committee on Radio Interference) Ground Reference Plane Magnetic Field Horizontal Coupling Plane Hertz International Electrotechnical Commission kilohertz kilopascal kilovolt Line Impedance Stabilization Network Megahertz µh microhenry µf microfarad µs microseconds PRF RF RMS V/m VCP Pulse Repetition Frequency Radio Frequency Root-Mean-Square Volts per meter Vertical Coupling Plane MET Report: EMCS81657A-EURO 2009, MET Laboratories, Inc. Page v of v

7 Testing Summary 1.0 Testing Summary The following tests specified by EN were performed with the following results. Specification Test Description Compliance EN 55022: 2006 Radiated Emissions - Class B Compliant Table 1. Executive Summary of EN Compliance Testing MET Report: EMCS81657A-EURO 2009, MET Laboratories, Inc. Page 1 of 11

8 Equipment Configuration 2.0 Equipment Configuration 2.1 Overview MET Laboratories, Inc. was contracted by Linear Technology Corporation to perform testing on the, under Linear Technology Corporation purchase order number X14282T. This document describes the test setups, test methods, required test equipment, and the test limit criteria used to perform compliance testing of the Linear Technology Corporation, LTM8020 (200mA, 36V DC/DC μmodule) with the requirements of EN limits and Methods of Radio Disturbance characteristic of Information Technology Equipment. The results obtained relate only to the item(s) tested. Model(s) Tested: Model(s) Covered: EUT Specifications: Evaluated by: LTM8020 Primary Power: 34 to 36V Equipment Emissions Class: B Randy Hoopai Date(s): August 07, Test Site All testing was performed at MET Laboratories, Inc., 3162 Belick St. Santa Clara, CA All equipment used in making physical determinations is accurate and bears recent traceability to the National Institute of Standards and Technology. 2.3 Description of Test Sample The LTM8020, Equipment Under Test (EUT) is a 36Vin, 200mA step down switching power converter. It was mounted to the DC1194A demonstration board. MET Report: EMCS81657A-EURO 2009, MET Laboratories, Inc. Page 2 of 11

9 Equipment Configuration A Power Supply 1 Input Cable B EUT C Resistive Load (Connected directly to EUT) AC Power Figure 1. Block Diagram of Test Configuration 2.4 Equipment Configuration The EUT was set up as outlined in Figure 1. All equipment incorporated as part of the EUT is included in the following list. Ref. ID Slot # Name / Description Model Number Part Number Serial Number Rev. # B N/A 200mA, 36V DC/DC μmodule Table 2. Equipment Configuration LTM8020 LTM8020EV Support Equipment Support equipment necessary for the operation and testing of the EUT is included in the following list. Ref. ID Name / Description Manufacturer Model Number Customer Supplied Calibration Data A Power Supply Power Designs TPS343B -- C Resistive Load N/A N/A -- Table 3. Support Equipment MET Report: EMCS81657A-EURO 2009, MET Laboratories, Inc. Page 3 of 11

10 Equipment Configuration 2.6 Ports and Cabling Information Ref. ID Port name on EUT 1 Input Cable Description or reason for no cable 2 conductor, 18 AWG (3 conductor for 1.25Vout configuration) Table 4. Ports and Cabling Information Qty Length as tested (m) Max Length (m) Shielded (Y/N) Termination Box ID & Port Name No Vin 2.7 Mode of Operation The EUT will be continuously power from 36Vin lab grade power supply. There will be three configurations tested: Vout loaded to 200mA. An additional 5V bias is required when running this low of an output voltage Vout loaded to 200mA 3. 5Vout loaded to 200mA this is maximum output power configuration 2.8 Method of Monitoring EUT Operation 1. The output voltage will be in regulation. 2. The output voltage will be significantly above or below its regulation point. 2.9 Modifications to the EUT No modifications were made to the EUT Disposition of EUT The test sample including all support equipment (if any), submitted to the Electro-Magnetic Compatibility Lab for testing was returned to Linear Technology Corporation upon completion of testing. MET Report: EMCS81657A-EURO 2009, MET Laboratories, Inc. Page 4 of 11

11 Immunity Criteria 3.0 Electromagnetic Compatibility Emission Criteria 3.1 Radiated Emission: Limits of Electromagnetic Radiation Disturbance Test Method: EN 55022: A1: A2:1997 Limits and Methods of Measurement of Radio Disturbance Characteristics of Information Technology Equipment. Test Requirement(s): EN 55022, Section 6, Limits for Radiated Disturbances: For radiated emission in the frequency range 30 MHz MHz, the EUT shall meet the Class B radiated emission limits shown in Table 5. Frequency Band (MHz) Class A Quasi-Peak limits 10 m measurement distance (dbμv/m) Class B Quasi-Peak limits 10 m measurement distance (dbμv/m) 30 to to Table 5. Electromagnetic Radiated Disturbance limits from Clause 6 of EN Test Procedure: The EUT was placed on a non-metallic table, 80 cm above the ground plane inside a semi-anechoic chamber. The method of testing, test conditions, and test procedures of EN were used. An antenna was located 3 m from the EUT on an adjustable mast. A pre-scan was first performed in order to find prominent radiated emissions. For final emissions measurements at each frequency of interest, the EUT was rotated and the antenna height was varied between 1 m and 4 m in order to maximize the emission. Measurements in both horizontal and vertical polarities were made and the data was recorded. Unless otherwise specified, measurements were made using a quasi-peak detector with a 120 khz bandwidth. Emissions measured at 3m were normalized using an inverse proportionality factor of 20dB per decade for comparison to the 10 m limit. The physical size of the EUT was taken into account as to avoid near-field effects, which could occur near 30 MHz. See Photograph 1 for a picture of the test setup. Environmental Conditions for Radiated Emission Ambient Temperature: 22 C Relative Humidity: 48 % MET Report: EMCS81657A-EURO 2009, MET Laboratories, Inc. Page 5 of 11

12 Immunity Criteria Test Results: The EUT was compliant with the requirement(s) of this section. Test Engineer(s): Randy Hoopai Test Date(s): 07/16/09 MET Report: EMCS81657A-EURO 2009, MET Laboratories, Inc. Page 6 of 11

13 Immunity Criteria Radiated Emission: Limits of Electromagnetic Radiation Disturbance, Test Results Frequency (MHz) Antenna Polarity EUT Azimuth (Degrees) Antenna Height (cm) Uncorrected Amplitude ACF (db/m) Pre Amp Gain CBL DCF Corrected Amplitude Limit Margin H H H H H V Table 6. Radiated Emission Test Results, Mode 1 36Vin, 1.25Vout, 200mA Note: The EUT was tested at 3 m. The data has been corrected for comparison with the 10 m limit using the formula: 20log(3 m/10 m) as expressed in the 'Distance Correction' column. MET Report: EMCS81657A-EURO 2009, MET Laboratories, Inc. Page 7 of 11

14 Immunity Criteria Radiated Emission: Limits of Electromagnetic Radiation Disturbance, Test Results Frequency (MHz) Antenna Polarity EUT Azimuth (Degrees) Antenna Height (cm) Uncorrected Amplitude ACF (db/m) Pre Amp Gain CBL DCF Corrected Amplitude Limit Margin 82.4 H H H V H H Table 7. Radiated Emission Test Results, Mode 2 36Vin, 2.5Vout, 200mA Note(s): The EUT was tested at 3 m. The data has been corrected for comparison with the 10 m limit using the formula: 20log(3 m/10 m) as expressed in the 'Distance Correction' column. In the plot below, peaks at 106, 119, and 278 MHz are not from EUT. MET Report: EMCS81657A-EURO 2009, MET Laboratories, Inc. Page 8 of 11

15 Immunity Criteria Radiated Emission: Limits of Electromagnetic Radiation Disturbance, Test Results Frequency (MHz) Antenna Polarity EUT Azimuth (Degrees) Antenna Height (cm) Uncorrected Amplitude ACF (db/m) Pre Amp Gain CBL DCF Corrected Amplitude Limit Margin H V H H V H Table 8. Radiated Emission Test Results, Mode 3 36Vin, 5Vout, 200mA Note(s): The EUT was tested at 3 m. The data has been corrected for comparison with the 10 m limit using the formula: 20log(3 m/10 m) as expressed in the 'Distance Correction' column. In the plot below, peak at 144 MHz, and peaks between 200 and 300 MHz are not from EUT. MET Report: EMCS81657A-EURO 2009, MET Laboratories, Inc. Page 9 of 11

16 Immunity Criteria Radiated Emission: Limits of Electromagnetic Radiation Disturbance, Test Setup Photograph 1. Radiated Emission: Limits of Electromagnetic Radiation Disturbance, Test Setup MET Report: EMCS81657A-EURO 2009, MET Laboratories, Inc. Page 10 of 11

17 Test Equipment 4.0 Test Equipment Calibrated test equipment utilized during testing was maintained in a current state of calibration per the requirements of ANSI/NCSL Z and ANSI/ISO/IEC 17025:2000. Test Name: EN (CISPR 22):1998 Radiated Emissions Electric Field Test Date(s): 07/16/09 MET Asset # Nomenclature Manufacturer Model Last Cal Date Cal Due Date 1S Meter Chamber Panashield /22/ /22/2009 1S2501 EMI Test Receiver Rhode & Schwarz ESU40 4/27/2009 4/27/2010 1S2484 Bilog Antenna Teseq CBL6112D 1/27/2009 1/27/2011 1S2518 Thermo-Hygrometer Fisher Scientific D 11/14/ /13/2009 MET Report: EMCS81657A-EURO 2009, MET Laboratories, Inc. Page 11 of 11